/*
 * The MIT License
 *
 * Copyright (c) 2011 Takahiro Hashimoto
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package jp.a840.websocket.handler;

import java.nio.ByteBuffer;

import jp.a840.websocket.WebSocket;
import jp.a840.websocket.exception.WebSocketException;
import jp.a840.websocket.frame.Frame;

/**
 * The Class WebSocketPipeline.
 *
 * @author Takahiro Hashimoto
 */
public class WebSocketPipeline {

    /**
     * The start chain.
     */
    private StreamHandlerChain startChain;

    /**
     * The last chain.
     */
    private StreamHandlerChain lastChain;

    /**
     * Send handshake upstream.
     *
     * @param ws     the ws
     * @param buffer the buffer
     * @throws jp.a840.websocket.exception.WebSocketException the web socket exception
     */
    public void sendHandshakeUpstream(WebSocket ws, ByteBuffer buffer) throws WebSocketException {
        lastChain.nextHandshakeUpstreamHandler(ws, buffer);
    }

    /**
     * Send handshake downstream.
     *
     * @param ws     the ws
     * @param buffer the buffer
     * @throws jp.a840.websocket.exception.WebSocketException the web socket exception
     */
    public void sendHandshakeDownstream(WebSocket ws, ByteBuffer buffer) throws WebSocketException {
        startChain.nextHandshakeDownstreamHandler(ws, buffer);
    }

    /**
     * Send upstream.
     *
     * @param ws     the ws
     * @param buffer the buffer
     * @param frame  the frame
     * @throws WebSocketException the web socket exception
     */
    public void sendUpstream(WebSocket ws, ByteBuffer buffer, Frame frame) throws WebSocketException {
        lastChain.nextUpstreamHandler(ws, buffer, frame);
    }

    /**
     * Send downstream.
     *
     * @param ws     the ws
     * @param buffer the buffer
     * @param frame  the frame
     * @throws WebSocketException the web socket exception
     */
    public void sendDownstream(WebSocket ws, ByteBuffer buffer, Frame frame) throws WebSocketException {
        startChain.nextDownstreamHandler(ws, buffer, frame);
    }

    /**
     * Adds the stream handler.
     *
     * @param handler the handler
     */
    public void addStreamHandler(StreamHandler handler) {
        StreamHandlerChain c = new StreamHandlerChain(handler);
        if (startChain == null) {
            startChain = c;
            lastChain = c;
        } else {
            lastChain.add(c);
            lastChain = c;
        }
    }

    @Override
    protected void finalize() throws Throwable {
        startChain.clear();
        super.finalize();
    }
}
